Issue #20207 has been updated by alanwu (Alan Wu). I get a SEGV on darwin if I run it repeatedly. With Valgrind on Linux I get: ``` ==216941== Invalid read of size 4 ==216941== at 0x4AA75B0: match_at (regexec.c:3894) ==216941== by 0x4AB0D2C: onig_search_gpos (regexec.c:5361) ==216941== by 0x4AB1209: onig_search (regexec.c:5090) ==216941== by 0x4A8D811: reg_onig_search (re.c:1725) ==216941== by 0x4A922B2: rb_reg_onig_match (re.c:1661) ==216941== by 0x4A949EA: rb_reg_match_p (re.c:3821) ``` Which points to the following: ``` CASE(OP_POP_POS) MOP_IN(OP_POP_POS); { STACK_POS_END(stkp); s = stkp->u.state.pstr; sprev = stkp->u.state.pstr_prev; } MOP_OUT;
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Bug #20207: Segmentation fault for a regexp containing positive and negative lookaheads
https://bugs.ruby-lang.org/issues/20207#change-106454
* Author: Sundeep (Sundeep Agarwal)
* Status: Open
* Priority: Normal
* Assignee: make_now_just (Hiroya Fujinami)
* Backport: 3.0: DONTNEED, 3.1: DONTNEED, 3.2: DONTNEED, 3.3: REQUIRED
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I'm getting segmentation fault for the following regexp with Ruby 3.3.0:
``` ruby
puts 'clan'.match?(/(?=.*a)(?!.*n)/)
This is the minimal example for which I was able to produce the issue. `a` and `n` in the above example are just a sample, can be other character combinations too. There has to be at least two characters before them in the input string (`cl` in the above example). The error is seen when the above code is run from a file, but only occasionally from irb. When run from a file, most of the time I get segmentation fault (see attached log file), but sometimes I get the following error: ``` ruby lookaround.rb:1:in `match?': undefined bytecode (bug): /(?=.*a)(?!.*n)/ (RegexpError) from lookaround.rb:1:in `<main>' ``` When asked in the r/ruby forum, somebody else was able to reproduce this issue. They also mentioned that the issue wasn't seen in the Ruby 3.2.2 version. ---Files-------------------------------- lookaround_segfault.log (15.9 KB) -- https://bugs.ruby-lang.org/